They agreed to settle the dispute by peaceful means.

【答案】：D
D．句意为：他们同意采取和平的方式解决这一争端。settle意为“解决”，尤指结束某一争论或争端，通常和argument／matter搭配；solve意为“解决”；通常指某一问题，和problem搭配；这两个词意思上很相近。因此D项正确。

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